Which of the following function definitions follows valid syntax?

Group of answer choices

myFunction$($num$1,$ num$2)\{$

return num$1*$ num$2$; $//$ Returns the product of p$1$ and p$2$

$\}$

function $=$ myFunction$($num$1,$ num$2)\{$

return num$1*$ num$2$; $//$ Returns the product of p$1$ and p$2$

$\}$

function myFunction$($num$1,$ num$2)$

return num$1*$ num$2$; $//$ Returns the product of p$1$ and p$2$

function myFunction$($num$1,$ num$2)\{$

return num$1*$ num$2$; $//$ Returns the product of p$1$ and p$2$

$\}$

I don't know